METHOD OF PRODUCING VINYL ACETATE Russian patent published in 2016 - IPC C07C67/05 C07C69/15 C07C67/55 B01J8/24 G01N21/65 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing vinyl acetate, where said method includes: (a) reacting in a reactor (i) 65 to 80 mol% of ethylene, (ii) 10 to 25 mol% of acetic acid, and (iii) 5 to 15 mol% of an oxygen-containing gas in presence of a palladium gold catalyst in a reactor to produce vinyl acetate; (b) withdrawing from reactor a gas stream comprising ethylene, acetic acid, vinyl acetate, water, and carbon dioxide; (c) separating gas stream into an ethylene stream comprising ethylene and carbon dioxide, and a primary vinyl acetate product stream comprising vinyl acetate, water, and acetic acid; (d) separating ethylene stream into a recovered ethylene stream and a carbon dioxide stream; (e) separating primary vinyl acetate product stream into a vinyl acetate product stream and a recovered acetic acid stream; (f) recycling recovered ethylene stream of step (d) and recovered acetic acid stream of step (e) to reactor in step (a); (g) measuring concentration of a component involved in or associated with one or more of above steps by Raman spectroscopic analysis wherein measuring step includes step of identifying Raman shifts and intensity of component involved in or associated with one or more of above steps; and (h) adjusting conditions in reactor or in any of subsequent steps in response to measured concentration of component to achieve a proper control of reaction or any of subsequent steps.

EFFECT: invention discloses a method for controlling process of producing vinyl acetate which allows to directly measure concentration of several components and directly transmit measurement results to control room for controlling production process.

9 cl, 2 tbl, 1 ex